Magnetic nano silver antibacterial material and preparation method thereof
A technology of magnetic nano and antibacterial materials, applied in botany equipment and methods, chemicals for biological control, sterilization/microdynamic water/sewage treatment, etc., can solve the difficulty of separating polymer microspheres or silica gel microspheres , restrictions, safety hazards of nano-silver particles and other issues, to achieve the effect of improving anti-oxidation and anti-dissolution ability, improving persistence, and good antibacterial advantages
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Embodiment 1
[0037] Embodiment 1: the preparation method of magnetic nano-silver antibacterial material of the present invention
[0038] Fe provided by the present invention 3 o 4 -SiO 2 -Schematic diagram of the synthesis of Ag magnetic nano-silver antibacterial material figure 1 As shown, its specific preparation method can be divided into the following three steps:
[0039] First, Fe was prepared by hydrothermal oxidation 3 o 4 nanoparticles. First, 2.5g FeSO 4 ·7H 2 O was dissolved in 30 mL of deionized water; in a water bath at 30°C with vigorous stirring, 10 mL of 50 (g / L) polyethylene glycol-20000 (PEG-20000) and 30 mL of 28% ammonia were added dropwise to the above solution; Keep the pH around 10, then add 30% hydrogen peroxide (H 2 o 2 ) solution 0.27mL, after stirring for 20 minutes, put the above mixed solution into a stainless steel reaction kettle lined with polytetrafluoroethylene, seal it and place it in an oven at 180°C, take it out after heating for 5 hours, and...
Embodiment 2
[0042] Embodiment 2: prepare Fe of the present invention 3 o 4 -SiO 2 -Condition optimization of Ag magnetic nano antibacterial materials
[0043] In the preparation of magnetic nano-silver antibacterial materials, different doses of TEOS were selected for SiO 2 coating, different doses of AgNO 3 And lactose solution to prepare nano-silver, the mass percentage, magnetism and antibacterial ability of each part of the obtained antibacterial agent are different. Therefore, in this example, the dosage of TEOS and AgNO 3 The ratio of lactose concentration is optimized.
[0044] 1. Dose optimization of TEOS
[0045] to Fe 3 o 4 When particles are coated with silica gel, if the dose of TEOS is too small, the 3 o 4 If the silica gel layer coated on the surface of the particles is too thin, the nano-silver particles that can be loaded in the next step will be relatively small, which will affect its bactericidal effect; and if the dose of TEOS is too large, the formed silica g...
Embodiment 3
[0053] Embodiment 3: Structural characterization of magnetic nano-silver antibacterial material of the present invention
[0054] The present embodiment is the structural characterization of the third group of magnetic nano-silver antibacterial materials optimized in Example 2, specifically as follows:
[0055] 1. EDX spectrum
[0056] Adopt DX-4 type X-ray energy spectrometer (Philips company) to measure the element composition in the magnetic nano-silver antibacterial particle, the result is as follows figure 2 shown. The mass percentages of various elements are shown in Table 3;
[0057] Table 3Fe 3 o 4 -SiO 2 -Mass percentage of various elements in Ag magnetic nanoparticles
[0058]
Fe
O
Si
Ag
The mass of various elements
Ratio (%)
66.0
19.2
1.40
13.4
[0059] 2. XRD spectrum
[0060] The X-ray diffraction (XRD) spectrum of magnetic nano-silver antibacterial particles is obtained on...
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